Billing machine



FIG. 1 is a perspective view of the billing machine showing my newdesign;

FIG. 2 is a plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a left elevational view thereof; and

FIG. 7 is a bottom view thereof.

The ornamental design for a billing machine, as shown and described.